Community Forum

Dynamic Range Window violations & T3 time-outs

New Poster

Dynamic Range Window violations & T3 time-outs

Hi all,

 

I've been having some issues with my previous modem (SB6141) since Xfinity dropped new gigabit fiber lines in my area on July 15th. Multiple times throughout the day, the modem will drop connection and restart; logs were saying due to power reset, so I assumed it was due to an aging modem and replaced it.

 

I just got a brand new SB6183 in today, provisioned it, and have been running it for the past 4 hours with no issue, and then it happened again, where everything timed out for a half minute and then a T3 time-out was logged. Along with this, I was noticing a ton of corrected and uncorrected packets showing on the status page, and wanted to see if that was in any way related or an issue to look out for. Any help would be greatly appreciated!

 

Status

Logs

Expert

Re: Dynamic Range Window violations & T3 time-outs

The SNR is too low / out of spec on some of the downstream channels. It appears that there is some noise ingress leaking into the line(s) somewhere. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems. You may need to get a tech out to investigate this one but try this stuff first and see if anything applies;

 

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
New Poster

Re: Dynamic Range Window violations & T3 time-outs

I was hoping it would be something I could finish troubleshooting without a tech Smiley Sad

Checked the lines coming onto the property, I didn't find a splitter anywhere. The I reconnected all ends, but signal is still coming out about the same. I'll book a tech to come out and investigate. Thank you for the suggestions!

Expert

Re: Dynamic Range Window violations & T3 time-outs

Your welcome ! I was hoping that I would hit the lottery sometime in my life !!   Oh well.... Smiley Sad Good luck with it !!



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!